SURFACTANT SELECTION METHOD FOR IMPROVING WELL PRODUCTIVITY Russian patent published in 2017 - IPC C09K8/584 C09K8/86 

FIELD: mining.

SUBSTANCE: invention relates to underground formations hydraulic fracturing liquids at production of hydrocarbons. Method of surface-active substance (SAS) selecting for use in hydraulic fracturing liquid in underground formation treating, comprising provision of at least two SAS, sampling of water from treated formation, sampling of crude oil from treated formation, sampling of core from treated formation, selection of proppant for use in treated formation, mixing of each SAS with said water sample with creation of SAS and said water sample mixture specimens, determination of SAS solubility for each of said specimen of mixture of SAS and water samples and assignment of quality parameter by solubility to each SAS, determination of SAS dynamic surface tension for each of said sample of SAS and water samples mixture and assignment of quality parameter on dynamic surface tension to each SAS, mixing of each of SAS with oil sample creation of SAS and said oil sample mixture samples, determination of surface tension at phase boundary between solutions of SAS and crude oil for each SAS and oil sample and assignment to each SAS of quality parameter by surface tension at phase boundary, determination of ability to create emulsion with solutions of SAS and crude oil for each SAS and oil sample and assignment to each SAS of quality parameter according to ability to create emulsion, pumping of each SAS solution through said ground core saturated with crude oil sample to produce effluent, determination of oil recovery for each SAS by effluent and assignment to each SAS of quality parameter by oil recovery, determination of capillary pressure in said core for each SAS and assignment to each SAS of quality parameter by capillary pressure, determination of adsorption on selected proppant for each SAS and assignment to each SAS of quality parameter by adsorption on selected proppant, summation for each SAS of obtained quality parameters by at least two above mentioned characteristics and selection of SAS with sum of quality parameters maximum value. Invention is developed in depending points of the formula.

EFFECT: technical result is formation treatment increased efficiency.

8 cl, 7 ex, 5 dwg, 2 tbl